Material Node Problem
The mix node is for mixing different shaders, or materials, not different parts of one material. To add the "Texture" effect you want, I took a look at your file and reconfigured your shader to use a Bump node.

First, within the Chocofur_Fabric_Basic material, I removed the overlay node (unnecessary) and replaced it with a Bump node, routing the Main_Color input directly to the shaders and the Bump into their respective Normal inputs.



Back in your main material node setup, I removed redundant nodes and hooked the sideways skirting color into the Main_Color input of the fabric shader and the Chocofur texture image into the Texture_Input input of the fabric shader.



Here is the final Blend file: